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The Twin Traction Beam or TTB was used in the Ford F-250 from 1980 to 1997. The TTB Dana 50 was also used selectively in the F-350 from 1980 to 1986. The GVW was lower in a F-350 with a TTB Dana 50, than a F-350 with a solid axle. The GAWR of a TTB Dana 50 was 4600 lbs.
In the 1980s and 1990s, Ford used a form of IFS known as "Twin Traction Beam" (TTB). This Dana 44 had no axle tubes but attached to the driver side traction beam, which also acted as a cover plate, and had "open air" axles which traveled through the beams to the spindles. The axles had u-joints to allow for the independent action of the beams.
The F-150 4×4 continued the use of the Dana 44 Twin-Traction Beam axle from the 1980–1991 trucks, and the Ford 8.8" rear straight axle. The 4×4 F-250 carried the Dana 50 Twin Traction Beam axle, the Sterling 10.25 from the previous generation for the rear; full-float on the F-250 HD and the 4×4 F-350 used the Dana 60 front straight axle ...
Twin-Traction Beam was invented by John A. Richardson and Donald G. Wheatley of Ford Motor Company covered by US patent 3,948,337 issued April 6, 1976. The patent name was “Independent front suspension for front-wheel drive” which was assigned to Ford Motor Company. [1] [2] The Dana Holding Corporation manufactured
The Dana 50 axle featured on most F-250 Super Duty trucks differs greatly from the early models. The Dana 50 started out as a Twin-Traction Beam axle (much like independent suspension) in 1980 and lasted to 1997 models. The Super Duty models then used a solid-axle version of this axle.
The 2nd Generation axles were driver's side with ball joints. 30 spline axle shafts were used instead of 35 splines, except 2000, 2001 and 2002 models which were equipped with 32 spline axle shafts. GM versions are passenger side differential drop, standard rotation gears, kingpin knuckles and 35 spline axle shafts.
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